Ship&#39;s davit



July 14, 1925.

A. WELIN ET AL SHIPS DAVIT Filed Aug. 16. 1919 3 Sheets-Shut 1 ATTORNEY A. WELlN ET AL July 14,1925.

SHIP S DAVIT Filed Aug. 16, 1919 3 Sheets-Sheet 2 l VENTORS ATT RNEY July 14, 1925. 4 1,545,717

A. WELIN ET AL V SHIP'S DAVIT Fil ed Aug. 16, 1919 3 Sheets-Sheet 5 ATTORN EY Patented July 14, 1925.

AKE'L WELINiAND .ARTHUi'R WILLIAM DAVIS, LONDDN, ENGLAND; SAID *"WEIJIN iris mum-inn maxim r ,WSEIITN DAVIT a.

=BOA-T- GOBZRORATIOEN, iAsGO R PoRA llflN- YORK.

snirs DAVJT.

Application.fi1e'd.-;1ugust 16, 1919. serial No. 317,950.

Gasman UNDER PRDYISIpIiSwF Aer ,ormancne, 1921, 4i-smr. 1.., 13 13.)

V ments in sl'iips Davits (for which applications have beenfi'filed in England August lst, 1918,Patent No. "130,457 of which the following is a specification. I

to provide a pivota-llyanounted d'avit comprising two relatively movableparts, one of which parts carries the other and is adapted to swingfin a verti'calplane to opposite sides ofits pivot and the other part isadapted to move relatively to the carrier part and extend further inboard and outboardthan said carrier part, thusprocuring maximum outreach and inboard extensionand enabling a boat to be swung inboard Hand outboard without any torsional strain on the davit and a'ininiinumof stress onthe actuating mechanism thereof.

More:particularlyflthis invention comprises aisbase part having a-long: socket and pivoted on the deck of a vessel 1 to: swing to 1 inboard and outboard positions whiichiiicline in op-f posite directions to the'wperpen dici'ilar p0S1' tion, and'a n armpart mounted-in androtatable axially 'in Sit-1d'SOOliGtiIIId httVIHg anoverhanging port on from which the boat is suspended and which is soaused to travel in a substantially horizontal direction simultaneously with the vertical sw nging of the said base part, which :vertical swinging is preferably accomplished by suitable operatingmecha-nism.

In" the preferred embodiment of our invention, the base part -is -provi'ded "with a long socket and is'pivoted'on a' 'hori zontal pivot i mounted on the deck of vessel to move in a verticalzplane about-said pivot byoperating mechanism 'coinprising -a" 1 ink attached atone end'to the'top'o'f the base part and at its otherend having a pivotal connection with an arm fast with an arcuate plate provided with asegmental rack meshing with a pinion on a shaft mounted in. an elevated position in a vertica'llydis posed frame paiidsaid base part carries an arm part comprising a substantiallyistraightlhe primary object-of this invention is' lower *portiondroppd into said socket and free to turn axially therein, and an uppereiifi the "load o1boatis suspended.

- (Dther objects of is this invention will "be-in part obvious from the annexed drawings -curved overhanging portin, "from which and gill part'indicated in connection there- With by vention.

the members andi in the relative ;proportion' ing and d spositionthereof,- all as more completely outlined in the following speeification andin said drawings.

:1 0 enableothers skilled in the art sofully to comprehend the underlying features of our invention that they'i'nay embody the same by numerous modifications in structure and 1 relationship of parts contemplated by this invention, drawings depicting a prje' ferredform have'been annexed as apart "of this disclosure, and insuch T drawings like characters of re'ferencejdenote correspond ing parts throughout all theviews, of Which:'. a

Fig; l is a sifde elevation o' fa *davit'in inboard position with a -boatv=suspended therefrom; I V Fig. 2 is a similar view of a -davitfii-n its outboardposition p r r Fig. 3--is elevation of a 'davit' and sus- PQHdQdQ-bOflfilQQklng. outboard;

"Fig. 4 is arear elevation of the device show-11in Figs l and 2, part of the "davit arm being broken-away; and i 1 'Fig. 5 -is a fragmentary View partly in section of the actuating mechamsm andjar-m in extended position.

*Referring-now to these drawings, 1- in'dicates a davit formed: of 1 a base part adapt-: ed: to swing in a vertical'plane to inc'lindpositions on opposite sides of a position perpendicular to. the deck 3 and anarm-i4: carried by said base p art a and :movable aerially in relation thereto. "Said base .-part-r 2f is providedwith ailong socket 2F and-the: arm part4 comprises a straight loWer- -por tionr t which is dropped into I said socket and an upper curved overhanging portionet from Whiclr'theboatis suspendedand which t'hefollowing analysis of this in;

is =-adapted simultaneously uwith-ithe vertical swinging of the base part to swing horizontally to opposite sides of the inclined planes which coincide with the axis of said base part when in its extreme posi tions. As illustrated, the vertically-swinging base part is pivoted on a horizontal pivot 5 mounted on the deck and disposed eontiguous to and parallel with the side of the vessel; and the arm part comprises a round bar having a lower straight portion dropped Y into socket and adapted to turn freely about its axis in said socket which forms a bearing therefor and an upper, curved --Joverhang1ng portion to the end of which the loadcomprising the boat 6 is attached.

As illustrated, the base part 2-is so swung in a. vertical. plane about its pivot 5 by opcrating mechanisincomprising a link 7 pivoted at oneof its ends as at? to the upper end of the ,said socketed base part 2, and pivotally connected at its opposite end, as

at-.8, to an armi9 fastwith an arcuate plate 9 mounted on a spindle 10 in a frame 11. The plate 9 is provided with an internal segmental rack 12 meshing with a pinion 13 on a spindle ltmounted in suitable bearings in an elevated position in said frame 11. The spindle 14; may berotated in any "suitable manner and,-as shown, has fast upon it a worm wheel15 meshing with a worm 16 on a shaft17 also supported in said frame and having a squared end adapted to litinto the socket of a crank or like device.

vIt may, under certain unusual conditions, be' desirable-when. the davit is ininboard position to temporarily fixv the arm partagainst rotation in its socket, and for this purpose we preferably provide registering holes 18 and 19 inthe said parts and insert a,pin 20 therein. Under ,ordinaryzconditions, however, the use of such a pin is unnecessary.

It will, 15is rotated in one direction the base part will be swung about its pivot 5 in a vertical plane from its inboard. position, which is inclined inwardly from a position perpen-.

dicular to the deck of'a vessel, to, its outboard position, which is inclined in the opposite direction. from said perpendicular, and that during this movement the rotatable arm part-will be cause-d to rotate about its axis so thatthe overhanging portion thereof will be causedto swing horizontally and toassume positions on opposite sides of ininclined. planes intersecting the axis of. the

vertically swinging part. of thedavit when the same is in its extreme positions, thus permitting a. more extended movement of the top of .the davit and, a consequent greater relative outreach than would be possible with an overhanging .part ,fixed in re lation-to the verticalswinging'part. that the rota- .It will bers'een furthermore be obvious that vvhen the shaft tionand horizontal swinging in combination with" thewertical' swinging will enable the load to be moved with less torsional strain on the davit arm than would be possible with relatively fixed parts, and furthermore that the stress on the operating mechanism is minimized.

lnFigs. 1 to 2 a davit is shown attached to one end ofa lifeboat 6 and mounted on the deck to have its straight part swing in a vertical planebeyond-the end of the lifeboat. This davit, of course,

comprises one of-a pair of davits, the other member of which-is similarly mounted and connected to the opposite end of the boat,

so that the pair are spaced apart a distance greater than the length of the boat and are so arranged as to permit a boat to bemoved by the actuating mechanism fromits supportsand swung outwardly between the said straight parts in parallel relationshlp to. the side of the vessel and without manual handling of the boat and without the zigzagginglof the boat usually necessary with round bar davits.

Having described our claim;

1. [In a davit, theocombination with a base, part having a socket and pivoted .at its: lower end on the deck of a vvessel and adaptedto swing in a vertical plane only to opposite sides of a perpendicular to the deck atits pivoted point, of an arm part having a straight portion mounted in said socket to rotate freely therein and an overhanging portion adapted to swing. horizontally to opposite sides of inclined planes coinciding with the axis of said base, part in its two extreme positions; and actuating.

mechanism; for swinging, the base part to cause a simultaneous horizotal swingingof the sald overhanging portion and a move.

menteof the boat to inboardand outboard positions, ,said actuating mechanism being mounted on the deck and. having a conneetion with theupper end of said base part.

'2. In a da'vit, the combination with a base part having a socket and pivoted at its. lower-end on the deck of. a vessel and adapted tojswing'in arvertical plane, only.

invention, we

into inclined positions on opposite sidesof I vertically to cause a simultaneous horizon-.

tal swinging ofthe said overhanging portion and. a movement of the boat to inboard; and outboard positions, respectively, said.

actuating mechanism comprising link pivoted to said base part contiguous to the upper end thereof and between the pivot and top of the davit, an arm mounted in an elevated position to turn in the arc of a circle and connected to said link and means for turning said arm to swing the davit.

3. In a davit, the combination with a base part having a socket and pivoted at its lower end on the deck of a vessel and adapted to swing in a vertical plane only into inclined positions on opposite sides of a perpendicular to the deck at its pivoted point, of an arm part having a straight portion mounted in said socket to rotate freely F therein, and an overhanging portion adapted to swing horizontally to opposite sides of the inclined planes coinciding with the axis of said base part in its two extreme positions, and actuating mechanism mounted inboard of said socket for swinging said base part vertically to cause a simultaneous horizontal swinging of the said overhanging portion and a movement of the boat to inboard and outboard positions, respectively, said actuating mechanism comprising a link pivoted to said base part contiguous to the upper end thereof and between the pivot and top of the davit, an arm mounted in an elevated position to turn in the arc of a circle and connected to said link and provided with a segmental rack, a pinion meshing with said rack and means for rotating the pinion.

' 4. In a davit, the combination with a base part having a socket and pivoted at its lower end on the deck of a vessel and adapted to swing in a vertical plane only intoinclined positions on opposite sides of a perpendicular to the deck at its pivoted point, of an arm part having a straight portion mounted in said socket to rotate freely therein, and an overhanging portion adapted to swing horizontally to opposite sides of the inclined planes coinciding with the axis of said base part in its two extreme positions, actuating mechanism mounted inboard of said socket for swinging said base part vertically to cause a simultaneous horizontal swinging of the said overhanging portion and a movement of the boat to inboard and outboard positions, respectively, said actuating mechanism comprising a link pivoted to said base part contiguous to the upper end'thereof between the pivot and top of the davit, an arm mounted in an elevated position to turn in the arc of a circle and connected to said link and provided with a segmental rack, a' pinion meshing with said rack and a worm gear for rotating said pinion.

In witness whereof, we have signed our names to the foregoing specification in the presence of two subscribing witnesses.

' AXEL WELIN.

ARTHUR WILLIAM DAVIS.

Witnesses as to signature of Axel Welin:

CHARLES J. GALE, JOSEPH F. OBRIEN.

Witnesses to the signature of Arthur WVilliam Davis:

W. P. SULLIVAN, L. T. REYNOLDS. 

